55 lines
2.1 KiB
C#
55 lines
2.1 KiB
C#
using System.Windows;
|
||
using System.Windows.Controls;
|
||
|
||
namespace SHH.CameraDashboard
|
||
{
|
||
/// <summary>
|
||
/// CameraItemTop.xaml 的交互逻辑
|
||
/// </summary>
|
||
public partial class CameraItemTop : UserControl
|
||
{
|
||
// 持有 ViewModel 的实例
|
||
private CameraItemTopViewModel _viewModel;
|
||
|
||
public CameraItemTop()
|
||
{
|
||
InitializeComponent();
|
||
|
||
// 1. 初始化 ViewModel
|
||
_viewModel = new CameraItemTopViewModel();
|
||
|
||
// 2. 设置 DataContext，这样 XAML 里的 {Binding Name} 就能找到 VM 里的属性
|
||
this.DataContext = _viewModel;
|
||
}
|
||
|
||
// ============================================================
|
||
// 定义依赖属性 (DependencyProperty) - 这是接收绑定的关键
|
||
// ============================================================
|
||
|
||
// 注册一个名为 "DataSource" 的依赖属性
|
||
public static readonly DependencyProperty DataSourceProperty =
|
||
DependencyProperty.Register(
|
||
nameof(DataSource), // 属性名
|
||
typeof(WebApiCameraModel), // 属性类型
|
||
typeof(CameraItemTop), // 所属类型
|
||
new PropertyMetadata(null, OnDataSourceChanged)); // 回调函数
|
||
|
||
// 这是一个普通的包装属性，方便代码访问
|
||
public WebApiCameraModel DataSource
|
||
{
|
||
get => (WebApiCameraModel)GetValue(DataSourceProperty);
|
||
set => SetValue(DataSourceProperty, value);
|
||
}
|
||
|
||
// 当外部绑定的数据发生变化时（比如用户在左侧列表点选了新项）
|
||
private static void OnDataSourceChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
|
||
{
|
||
var control = d as CameraItemTop;
|
||
if (control != null && control._viewModel != null)
|
||
{
|
||
// 【核心逻辑】将外部传进来的数据，转发给 ViewModel
|
||
control._viewModel.Camera = e.NewValue as WebApiCameraModel;
|
||
}
|
||
}
|
||
}
|
||
} |